Prairie mounds are unique soil landscape features distributed across the Arkansas River Valley in eastern Oklahoma and western Arkansas.  Mounds in this area can be as large as one-meter in height and fifteen- to thirty- meters in diameter.  They commonly have a fragipan below an overthickened A horizon and above a lithologic discontinuity between loess and fine-textured alluvium or residuum.  A study of the characteristics of these fragipans could lend interesting insights into prairie mound genesis. A mound was bisected and the exposed mound-center profile was described and sampled according to standard methods.   Intact peds from the Bx1 (D­­_b­ = 1.79 g cm^-3) and Bx2 (D­­_b­ = 1.77 g cm^-3) were analyzed for bulk density using a 3D laser scanner.  Concretion content as well as abundance of vesicular, vugh and interconnected pore space as evaluated using X-ray computed tomography (CT) will be discussed.